Reduce the list, select first 2 letters of the city:
Listing cities (109 place(s)). Select the City to see the postcode(s):
Listing cities (109 place(s)). Select the City to see the postcode(s):
Position: Postcodes > Spain > Pais Vasco > S.... >
Postcode finder: Spain, List of the cities starting with S. Spain Pais Vasco Postcodes (Desktop version).